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Experimental demonstration of coherent combining with tip/tilt control based on adaptive space-to-fiber laser beam coupling
Li, Feng1,2; Geng, Chao1; Huang, Guan1; Yang, Yan1; Li, Xinyang1; Qiu, Qi2
Source PublicationIEEE Photonics Journal
Volume9Issue:2Pages:7891900
2017
Language英语
ISSN1943-0655
AbstractA novel approach of tip/tilt control through optimizing laser beam coupling efficiencies from space to polarization-maintaining-fibers with stochastic parallel gradient descent (SPGD) algorithm for coherent beam combining (CBC) applications is proposed and demonstrated experimentally using a seven-element adaptive fiber-optics collimator (AFOC) array for the first time to the best of our knowledge. Compared with the normal target-in-the-loop SPGD method with just a single cost function, the tip/tilt control here is independent of the phase-locking control and parallel for each cell of the AFOC array. Such characteristic gives the AFOC array capacities of real-time correction of fast-changing turbulence induced tip/tilt-type phase errors. Piezoelectric-ceramic-ring fiber-optic phase compensator and AFOC are developed to correct the piston- and tip/tilt-type aberrations, respectively. The power-in-the-bucket (PIB) metric is used for phase-locking. Parallel tip/tilt control is implemented via maximizing the received power in each subaperture with fixed two-channel SPGD control. The average of normalized coupling efficiencies of seven AFOCs increases from 0.76 without tip/tilt control to 0.94 under control. In CBC, the PIB metric increases by 4.6 times, and the phase residual error is less than λ/15. © 2017 IEEE.
KeywordCost functions - Efficiency - Fiber lasers - Fiber optics - Fibers - Gradient methods - Laser beams - Locks (fasteners) - Piezoelectric ceramics - Polarization-maintaining fiber - Stochastic systems
Indexed BySCI ; Ei
Document Type期刊论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/8806
Collection自适应光学技术研究室(八室)
Affiliation1.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China;
2.School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu; 610054, China
Recommended Citation
GB/T 7714
Li, Feng,Geng, Chao,Huang, Guan,et al. Experimental demonstration of coherent combining with tip/tilt control based on adaptive space-to-fiber laser beam coupling[J]. IEEE Photonics Journal,2017,9(2):7891900.
APA Li, Feng,Geng, Chao,Huang, Guan,Yang, Yan,Li, Xinyang,&Qiu, Qi.(2017).Experimental demonstration of coherent combining with tip/tilt control based on adaptive space-to-fiber laser beam coupling.IEEE Photonics Journal,9(2),7891900.
MLA Li, Feng,et al."Experimental demonstration of coherent combining with tip/tilt control based on adaptive space-to-fiber laser beam coupling".IEEE Photonics Journal 9.2(2017):7891900.
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